A) \[[Co{{({{H}_{2}}O)}_{4}}C{{l}_{2}}]\]
B) \[{{[Co({{H}_{2}}O)2C{{l}_{4}}]}^{2-}}\]
C) \[{{[CoC{{l}_{4}}]}^{2-}}\]
D) \[[Co({{H}_{2}}O)2C{{l}_{2}}]\]
Correct Answer: C
Solution :
CoCl2 is a weak Lewis acid, reacting with chloride ion to produce salt containing the tetrahedral [CoCl4]2- ion. CoCl2 is blue when anhydrous, and a deep magneta colour when hydrated, for this reason it is widely used as an indicator for water.
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